Thank you.

This weekend my son and I renewed the brake fluid in his 1981 280E, a recent acquisition. I was able to suck out the fluid from the rear chamber of the brake expansion tank, but not able to do so for the front chamber. The 123 Service Manual says to remove the brake fluid "pump out brake fluid via an open bleeder plug of the front axle and rear axle circuit."

Are there bleeder plugs for the front & rear axles respectively or do I simply open caliper bleeder plugs? When I did my daughter's W123, I removed the expansion tank and let the fluid run out the pipe of the front chamber.